6688 5 STAR
  • 6688 5 STAR
  • 6688 5 STAR
General Electric

6688 5 STAR

16.00 USD

 Top quality wide band amplifier tubes manufactured in the United States by General Electric. These high mutual conductance 9 pin miniature glass pentodes are designed for critical industrial and military applications. They come with short gray plates and top halo getters, and are glass etched 6688 U.S.A. with dot code. They are printed either in white or red with GE logo, 6688 ***** MADE IN U.S.A. with variable 1960's date codes. Boxes are standard white printed G.E. 6688 MADE IN U.S.A.

Condition

Tube Matching
Tube Matching
6.00 USD by tube

WHY ?

A tube may have one, two, or three internal sections depending on the purpose of the tube; somtimes these sections are all the same, sometimes they are different. Due to manufacturing and material tolerances, there may be slight differences between the original specification and the actual tube. Tube matching tests each one of these internal sections and selects tubes, compared to original specifications at manufacture, for balanced performance and good sound.

HOW ?

All our tubes are tested by us prior to packing on our Stark, AVO, Simpson or RF Laboratories Inc. calibrated testers. On request for tube matching, tubes are matched for Mutual Conductance in Micromhos and Plate Current in Milliamps on our Amplitrex or Radioelec Duovac testers, with results printed for each  individual tube. Certain tubes difficult to test are matched for Mutual Conductance in Micromhos only on one of our regular calibrated testers. On request we can also test for Microphonics.
Quantity
Last items in stock

General Electric
2 Items

Data sheet

Base
9 pin miniature Noval B9A
Boite type
1/2
Emplacement
47
Fonction
Pentode